I second the views of others. The Beneteau ST30 is too small for even a single guy to live aboard full time. Maybe a weekend but no more. It will have less than 1/3 the living space of your apartment. The fridge is probably a bar type, maybe 3 cu ft. You need at least 6 cu ft to pack enough for a week. When you are hanging out on the hook it isn't feasible to order take out or go to a grocery store daily.
Look for boats in the 35+ size range. Since this is your first boat, look for one ten years old or less. You don't want to do a lot of deferred maintenance or systems upgrades for your first boat.